Means for checking recorded information



Sept. 7, 1954 E. P. G. WRIGHT EI'AL MEANS FOR CHECKING RECORDED INFORMATION Filed Nov. 24, 1950 19 Sheets-Sheet l TA PE MA CH/NE.

Inventors E sMo/vo P. Q. wmaHr oo/vALo A. welk Jose-PH n/cE A Mme/; l

sept' 7 E. P. G, WRIGHT ETAL MEAN-S FOR CHECKING RECORDED INFORMATION Filed Nov. 24, 1950 19 Sheets-Sheet 3 w T/ME BASE OUTPUT. 2:/ .72) c2 Abode T s A7752 R754 R786 @768 R78 TIME BASE 0077-707 Inventors EsMoNo e @.wR/q/rr po/vALo A. wE/R uosEPH k/CE Sept. 7, 1954 E P. G. WRIGHT ETAL 2,683,656

MEANS FOR CHECKING RECORDED INFORMATION Filed Nov. 24, 1950 19 Sheets-Sheet 4 @STC (F/GA 5.)

+P csr ,wool/A70 5 Lead GA TE M Lead Inventors EsMoNo P. a. WRIGHT Donau: A. wE/R JosePH RICE A torney Sepi- 7, 1954 E. P. G. WRIGHT Erm. 2,633,656

MEANS FOR CHECKING RECORDED INFORMATION Filed Nov. 24, 1950 19 Sheets-Sheet 5 F/GS.

'c A/ ema cus cru cAa Kem@ cna-1 cAs cmo cra/0J.

\ C782 Cra-f cme c7258 67B@ CTC Il' l l I ""CTC/ CTCS Inventors EsMoNo P. G. WRIGHT ocmw A. sin JOSEPH RICE llorney SPt 7, 1954 E. P. G. WRIGHT ETAL 2,688,656

uns Foa cHEcKING RECORDED INFORMATION Filed Nov. 24. 195o l sheets-sheet s @ne ,w3

and Transfer Gates (Figs 3a/7d M) V Inventors esnono n c'. veran-r DONALD A. wel@ Jose/H mcs A Harney SPt 7, 1954 E. P. G. WRIGHT :TAL 2,688,656 l MEANS FOR CHECKING RECORDED INFQRuATIoN Filed Nov. 24, 1950 19 Sheets-Sheet 7 F/AGZ Marimys (Fly. /Zj

Mark/732s (F19 /7.`)

SePL 7 l954 E. P. G. WRIGHT Erm. 2,688,656

Mams Fon cHEcxmc RECORDED INFORMATION Filed Nov. 24. 1950 19 Sheets-Sheet 8 SCO SC/ SC2 )W04 s6 Rasta/f 64am W/O F ('6 '5) ssc/z: l M05 w24 @ego/f CA HBC nd C C NOC (FG'/ NPOc TOF/9| S65 564 SC3 POC "W/l/ ,W//a W//3 'SSC/ ses C41+ .sca

CDC W18 8+ T we/ T {L1/23 L 47o F/G. 3.

Inventors v {IPOND P. 6. WRIGHT MNLD A. WEIR JDSEPH RICE A Homey Sept. 7, 1954 MEANS FOR Filed Nov. 24, 1950 E. P. G. WRIGHT FAL CHECKING RECORDED INFORMATION 19 Sheets-Sheet 9 +B ssca W//7 NBC /23 lnvenfms EsMoND P. c. WRIGHT DONALD A. wE/R JQSEPH RICE Attorney Sept. 7, 1954 E. P. G. WRIGHT ETAL 2,638,656

MEANS Foa cHEcxING RECORDED INFORMATION Filed Nov. 24, 1950 19 Sheets-Sheet 10 F/G/O.

SSC/

" scl/ cszc Inventor: EsHoNo P. s. WRIGHT ocmw A. wem uEl-H RICE B917/- Home y Sept- 7, l954 E. P. G. WRIGHT x-:TAL 2,688,656

MEANS FOR cHEcxING RECORDED INFORMATION Filed Nov. 24, 195o 19 Sheets-sheet 11 ses "5 +5 ssc/ O CI C0 S Lead c@ ,Vf-02 f# SC/ +P w wi e@ s /m/ Prc? w//O T R75/ may' our c/Ufc/e Inventors Esnorva n s. wenn-r ooNALn A. wElR .JosefwA Rice ltorney SPf 7, l954 E. P. G. WRIGHT ETAL 2,688,656

mms FOR cHEcKm-s RECORDED INFORMATION Filed Nov. 24, 1950 19 Sheets-Sheet 12 M ffC/ bmx/(ers 5 te/epr/htc/f Inventors Esnorvn P. c1. WRIGHT ooNALo A. wE/R Jose-PH mcs A tlorney SePf- 7, 1954` E. P. G. WRIGHT ETAL 2,688,656

MEANS RoR cHscKING RECORDED INFORMATION Filed Nov. 24, 195o 19 sheets-Sheet xav,

' ,f RME 127414 sca /c 7c w45-1 p W55 WSW57 Pesto/1e C?? CC', 5 8.

H W58 *I rom lC6 W59 W55 nvenlors ESMoNo P. :iw/26H1' DoNALD A. w /R uosEPH RICE Attorney SePt- 7 1954 E .'P. G. WRIGHT Erm. 2,688,656

MEANS FOR cHEcKING RECORDED IN1-ommen Filed NOV. 24, 1950 l v 19 Sh66t-S-Sheet 14 Fl/G/4.-

RRI

7 Step 10u/.SesA SC2 CR 7C RME v FIO/77 5l' na/ .r gare (ff 1f Step Pu/ses.

+ .sca

500 PRS.

nvenlor.; EJnoNa P. 6. WRIGHT DONALo A. VE/R By i i Altar ey.

Sept. 7, 1954 E, P. G. WRIGHT ErAL 2,688,656

MEANS FOR CHECKING RECORDED INFORMATION Filed Nov. 24, 1950 19 Sheets-Sheet 15 CTC? . Il SLead Po /vPo M ead nvenlora EsHoNo P. 6. when? DONALD A. welk JosEPN R/E A Home y SPt 7 1954 E. P. G. WRIGHT ETAI. 2,688,656

MEANS FOR CHECKING RECORDED INFORMATION fue Inventors Esato/ID P. a. WRIGHT ONLD A. WER

JOSEPH RICE Attorney Sept 7 1954 E. P. G. WRIGHT Erm. 2,688,656

MEANS FOR CHECKING RECORDED INFORMATION Filed Nov. 24, 14950 19 Sheets-Sheet 17 nveniors EsMoNo P. t. vvk/awr ooNALn A. v5/R .JOSEPH R/cE BgZM/A ltorney Sept- 7 1954 E. P. G. WRIGHT ETAL 2,638,656

' MEANS FOR CHECKING RECORDED INFORMATION Filed Nov. 24, 1950 19 Sheets-Sheet 18 F/G/S.

eset @9J g l est Output Exam/he C# 5t SCE tol/1g 5c orsca J sca must,

st ep SC2 P4 a P5 Tr/gyer R52 C SZ @ece/why Wm@ paal/MSM@ g 2 44 6/, av, /2/ PU/se fmm RTA or C 7A caf/90de. Reset l 08, 408.etc. lo /206 vw/Lf SeCONGS iwf/7 P ,OU/5e.

me Exam /0, 30, 50, 70, 30, //0 Stop MAM as wmed) Steg Reg/sters E0, 40, 60, @0, /00, /20

A [tom Patented Sept. 7, 1954 UNITED STATES PATENT OFFICE MEANS FOR CHECKING RECORDED INFORMATION Application November 24, 1950, Serial No. 197,208

Claims priority, application Great Britain December 2, 1949 24 Claims. 1

The present invention relates to means and apparatus for checking information recorded on a recording medium.

Such data may be recorded for use in conjunction with a calculating machine to which the data will be supplied at some time subsequent to the time of recording.

One feature of the present invention comprises apparatus for checking items of information recorded on a recording medium which comprises means for extracting said information from the recording medium, means for comparing said information item by item with a second version of said information and means for giving an indication if said comparison indicates a difference.

Another feature of the present invention comprises apparatus for checking items of information recorded on a recording medium which comprises means for extracting said information from said recording medium, means for comparing said information item by item with a second version of said information, means for re-recording said information after comparison, means for giving an indication if said comparison indicates a difference, means for re-recording the correct version of an item of information for which said comparison means detects a difference and means for amending said information for re-recording by removal, by insertion, or by both removal and insertion of items of information.

Another feature of the present invention comprises apparatus for checking items of information recorded on a recording medium which comprises means for extracting said information item by item from the recording medium, a register controller in which each item so extracted is stored, means for supplying a second version of the information item by item to said register controller for storage therein, means responsive to storage of an extracted item of information and the second version thereof to apply said stored items of information to a comparator forming part of said register controller, means under control of said comparator for giving an indication of a difference if detected, and means for re-recording said information or the correct version thereof after said comparison.

Another feature of the present invention comprises apparatus for checking items of information recorded in printing telegraph code on magnetic tape which compirses a register controller comprising first and second character storage means and comparison means, means for apply- 2 l ing a second version of said information to said register controller for storage therein in said first character storage means one character at a time, each of said characters being stored singly in said storage means, means for extracting the recorded information from said magnetic tape character by character to apply it to said register controller for storage in said second character storage means, means for applying said stored characters from both said storage means consecutively element by element to said comparison means, means for giving an indication if a difference has been detected and means for re-recording certain or all of said items of information on said tape after checking.

Another feature of the present invention comprises apparatus for checking information recorded in printing telegraph code on a magentic tape or Wire which comprises a register controller comprising first and second character storage means and comparison means, a manually controlled teleprinter for typing second versions of the characters to be checked into the apparatus for storage in said first character storage means, means responsive to receipt of a character from said teleprinter to extract the corresponding character from the magnetic tape and to store it in said second storage means, means for applying said stored characters element by element to said comparison means, means under control of said comparison means for giving an indication if any discrepancy is detected, and means for re-recording each character on said magnetic tape after checking has revealed no discrepancy. Another feature of the present invention comprises apparatus for comparing two characters in a two condition (mark and space) code which comprises a two condition device, and means for applying said characters to said two-condition device element by element consecutively, in which if corresponding elements of said characters are identical the two condition device is in its first condition at the end of the comparison and if any element of one character differs from the corresponding element of the other character the two condition device is in its second condition at the end of the comparison.

Another feature of the present invention comprises apparatus for detecting a particular character in a two-condition (mark and space) code which comprises a two condition device, means for applying each element of a received character in turn to said two condition device, means for changing the condition of said two condition device if any element or elements of said received 

